JAMB Chemistry 2011 Objective — Question 32
Question 32 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be
- A. A. Fe2+Correct
- B. B. Pb2+
- C. C. Cu2+
- D. D. Fe3+
Explanation
The unknown solution originally contains Fe2+, whose heating with HNO3 will oxidize it to Fe3+, which manifests as brown coloration.
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